In 2001-02, cannabis offenders accounted for the largest proportion of drug offenders, with 55,494 offenders (75.2% of all drug offenders nationally). South Australia had the greatest proportion of offenders involved in cannabis with 93.0%, followed by the Northern Territory with 92.7%. Victoria had the lowest proportion of cannabis offenders, with 59.7% involved in this type of drug.

The next largest proportion of offenders involved amphetamine offences, accounting for 10.9% of all drug offenders nationally. Western Australia had the largest proportion of offenders involved in amphetamines with 18.1%, followed by the Australian Capital Territory with 15.9% and Victoria with 14.3%. South Australia and Tasmania had the lowest proportion of offenders involved in amphetamines, at 4.5% and 4.7% respectively.